Record envelope, standing records and threshold days for San Luis 1 S (USC00057428), Colorado, United States, with 59 years of record.
Key Facts for San Luis 1 S
San Luis 1 S (USC00057428) is a weather station in Colorado, United States at 37.20 latitude and -105.42 longitude, 2,421 m (7,943 ft) above sea level.
The station reports from 1893 to 1951, 59 years of record.
1,464 records set at San Luis 1 S still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Luis 1 S set a daily record precipitation of 3.3 mm (0.13 in) on 27 March 1951.
About the Station
Location: Colorado, United States, 37.20 latitude, -105.42 longitude.
Elevation: 2,421 m (7,943 ft).
Period of record: 1893 to 1951, 59 years.
Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at San Luis 1 S. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at San Luis 1 S, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.4 C (57.9 F)
-36.7 C (-34.1 F)
n/a
n/a
Feb
18.3 C (64.9 F)
-36.7 C (-34.1 F)
n/a
n/a
Mar
23.3 C (73.9 F)
-32.8 C (-27.0 F)
n/a
n/a
Apr
26.7 C (80.1 F)
-25.6 C (-14.1 F)
n/a
n/a
May
32.2 C (90.0 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-8.3 C (17.1 F)
n/a
n/a
Jul
35.0 C (95.0 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
0.0 C (32.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-8.3 C (17.1 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-22.8 C (-9.0 F)
n/a
n/a
Nov
22.2 C (72.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Dec
16.1 C (61.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at San Luis 1 S still stand. 1896 holds the most, with 82.
Standing records at San Luis 1 S by the year they were set
Year set
Standing records
1893
59
1894
64
1895
78
1896
82
1897
62
1898
80
1899
51
1900
69
1901
46
1902
45
1903
38
1904
49
1905
39
1906
49
1907
59
1908
39
1909
50
1910
42
1911
47
1912
41
1913
53
1914
21
1915
30
1916
41
1917
35
1918
48
1919
40
1920
30
1921
23
1922
34
1923
20
Wettest Day of Each Month
Oct: 76.2 mm (3.0 in)
The wettest day on record for each calendar month at San Luis 1 S. The most was 76.2 mm (3.0 in) on 13 October 1920.
Record daily precipitation for each month at San Luis 1 S
Month
Record daily precipitation (mm)
Date
Jan
16.8 mm (0.7 in)
19 January 1916
Feb
13.5 mm (0.5 in)
25 February 1895
Mar
38.1 mm (1.5 in)
18 March 1922
Apr
40.9 mm (1.6 in)
13 April 1896
May
26.9 mm (1.1 in)
5 May 1917
Jun
26.7 mm (1.1 in)
11 June 1913
Jul
42.7 mm (1.7 in)
12 July 1898
Aug
23.9 mm (0.9 in)
5 August 1910
Sep
25.7 mm (1.0 in)
10 September 1894
Oct
76.2 mm (3.0 in)
13 October 1920
Nov
20.3 mm (0.8 in)
1 November 1899
Dec
21.6 mm (0.9 in)
15 December 1915
Period of Record Coverage
1893 to 1923
Complete yearUnder 90 percent of days
31 years of record at San Luis 1 S, 1893 to 1923. 6 years have data for under 90 percent of days and are left out of rankings: 1904, 1905, 1919, 1920, 1921, 1923.
Cooler than the station meanWarmer than the station mean
One stripe for each of 20 complete years at San Luis 1 S, 1894 to 1922. Blue stripes are years cooler than the station's own mean of 5.7 C (42.2 F); red stripes are warmer. The coolest year was 1898, at 4.0 C (39.3 F), and the warmest was 1910, at 7.2 C (45.0 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at San Luis 1 S as warming stripes, 1894 to 1922
Year
Annual mean temperature
Difference from the station mean
1894
6.4 C
+0.71 C
1895
5.9 C
+0.19 C
1897
5.4 C
-0.26 C
1898
4.0 C
-1.65 C
1899
5.6 C
-0.06 C
1901
7.0 C
+1.34 C
1902
6.0 C
+0.31 C
1906
6.4 C
+0.71 C
1907
6.7 C
+0.99 C
1908
5.4 C
-0.27 C
1909
6.0 C
+0.32 C
1910
7.2 C
+1.53 C
1912
5.3 C
-0.35 C
1913
4.5 C
-1.16 C
1914
5.3 C
-0.38 C
1915
5.0 C
-0.68 C
1916
5.7 C
+0.05 C
1917
4.9 C
-0.81 C
1918
4.9 C
-0.74 C
1922
5.9 C
+0.18 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1893 to 1951
Yearly extremes at San Luis 1 S: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1896
30.6 C (87.1 F)
31
Coldest night (TNn)
-36.7 C (-34.1 F)
1895
-30.0 C (-22.0 F)
31
Wettest day (Rx1day)
76.2 mm (3.0 in)
1920
25.7 mm (1.0 in)
35
Wettest five days (Rx5day)
76.2 mm (3.0 in)
1920
38.6 mm (1.5 in)
35
Longest dry spell (CDD)
110 days
1903
35 days
35
Hottest day (TXx)
The hottest day of the year at San Luis 1 S, 1893 to 1951. The record is 36.7 C (98.1 F) in 1896, marked on the chart; the median year is 30.6 C (87.1 F).
Hottest day (TXx) at San Luis 1 S by year
Year
Hottest day (TXx)
1893
31.1 C (88.0 F)
1894
32.8 C (91.0 F)
1895
36.1 C (97.0 F)
1896
36.7 C (98.1 F)
1897
33.9 C (93.0 F)
1898
31.1 C (88.0 F)
1899
31.7 C (89.1 F)
1900
32.8 C (91.0 F)
1901
33.3 C (91.9 F)
1902
32.8 C (91.0 F)
1903
32.8 C (91.0 F)
1904
30.6 C (87.1 F)
1905
29.4 C (84.9 F)
1906
28.9 C (84.0 F)
1907
29.4 C (84.9 F)
1908
28.9 C (84.0 F)
1909
30.6 C (87.1 F)
1910
31.7 C (89.1 F)
1911
30.0 C (86.0 F)
1912
31.1 C (88.0 F)
1913
29.4 C (84.9 F)
1914
29.4 C (84.9 F)
1915
28.3 C (82.9 F)
1916
28.9 C (84.0 F)
1917
30.0 C (86.0 F)
1918
30.0 C (86.0 F)
1919
29.4 C (84.9 F)
1920
28.3 C (82.9 F)
1921
27.2 C (81.0 F)
1922
30.6 C (87.1 F)
1923
28.9 C (84.0 F)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
Coldest night (TNn)
The coldest night of the year at San Luis 1 S, 1893 to 1951. The record is -36.7 C (-34.1 F) in 1895, marked on the chart; the median year is -30.0 C (-22.0 F).
Coldest night (TNn) at San Luis 1 S by year
Year
Coldest night (TNn)
1893
-21.7 C (-7.1 F)
1894
-33.9 C (-29.0 F)
1895
-36.7 C (-34.1 F)
1896
-28.3 C (-18.9 F)
1897
-31.7 C (-25.1 F)
1898
-34.4 C (-29.9 F)
1899
-31.7 C (-25.1 F)
1900
-27.2 C (-17.0 F)
1901
-28.3 C (-18.9 F)
1902
-33.3 C (-27.9 F)
1903
-32.8 C (-27.0 F)
1904
-26.1 C (-15.0 F)
1905
-32.2 C (-26.0 F)
1906
-27.8 C (-18.0 F)
1907
-26.1 C (-15.0 F)
1908
-26.1 C (-15.0 F)
1909
-33.3 C (-27.9 F)
1910
-27.8 C (-18.0 F)
1911
-32.2 C (-26.0 F)
1912
-28.9 C (-20.0 F)
1913
-35.0 C (-31.0 F)
1914
-27.8 C (-18.0 F)
1915
-33.9 C (-29.0 F)
1916
-30.0 C (-22.0 F)
1917
-26.7 C (-16.1 F)
1918
-35.6 C (-32.1 F)
1919
-36.7 C (-34.1 F)
1920
-30.6 C (-23.1 F)
1921
-23.3 C (-9.9 F)
1922
-25.6 C (-14.1 F)
1923
-27.2 C (-17.0 F)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
Wettest day (Rx1day)
The wettest day of the year at San Luis 1 S, 1893 to 1951. The record is 76.2 mm (3.0 in) in 1920, marked on the chart; the median year is 25.7 mm (1.0 in).
Wettest day (Rx1day) at San Luis 1 S by year
Year
Wettest day (Rx1day)
1893
21.6 mm (0.9 in)
1894
25.7 mm (1.0 in)
1895
26.7 mm (1.1 in)
1896
40.9 mm (1.6 in)
1897
16.5 mm (0.6 in)
1898
42.7 mm (1.7 in)
1899
27.4 mm (1.1 in)
1900
19.3 mm (0.8 in)
1901
27.4 mm (1.1 in)
1902
17.8 mm (0.7 in)
1903
18.5 mm (0.7 in)
1904
25.4 mm (1.0 in)
1905
41.9 mm (1.6 in)
1906
35.6 mm (1.4 in)
1907
20.1 mm (0.8 in)
1908
33.0 mm (1.3 in)
1909
17.3 mm (0.7 in)
1910
23.9 mm (0.9 in)
1911
38.1 mm (1.5 in)
1912
22.1 mm (0.9 in)
1913
37.3 mm (1.5 in)
1914
29.2 mm (1.1 in)
1915
26.7 mm (1.1 in)
1916
17.0 mm (0.7 in)
1917
26.9 mm (1.1 in)
1918
20.6 mm (0.8 in)
1919
34.3 mm (1.4 in)
1920
76.2 mm (3.0 in)
1921
38.1 mm (1.5 in)
1922
38.1 mm (1.5 in)
1923
17.0 mm (0.7 in)
1948
8.6 mm (0.34 in)
1949
15.5 mm (0.6 in)
1950
20.3 mm (0.8 in)
1951
16.0 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at San Luis 1 S, 1893 to 1951. The record is 76.2 mm (3.0 in) in 1920, marked on the chart; the median year is 38.6 mm (1.5 in).
Wettest five days (Rx5day) at San Luis 1 S by year
Year
Wettest five days (Rx5day)
1893
30.7 mm (1.2 in)
1894
33.8 mm (1.3 in)
1895
37.4 mm (1.5 in)
1896
43.2 mm (1.7 in)
1897
24.6 mm (1.0 in)
1898
51.3 mm (2.0 in)
1899
47.6 mm (1.9 in)
1900
39.1 mm (1.5 in)
1901
52.2 mm (2.1 in)
1902
34.8 mm (1.4 in)
1903
20.9 mm (0.8 in)
1904
35.6 mm (1.4 in)
1905
41.9 mm (1.6 in)
1906
38.6 mm (1.5 in)
1907
26.4 mm (1.0 in)
1908
69.6 mm (2.7 in)
1909
40.2 mm (1.6 in)
1910
32.0 mm (1.3 in)
1911
50.1 mm (2.0 in)
1912
23.4 mm (0.9 in)
1913
46.3 mm (1.8 in)
1914
48.5 mm (1.9 in)
1915
37.6 mm (1.5 in)
1916
51.8 mm (2.0 in)
1917
28.9 mm (1.1 in)
1918
18.8 mm (0.7 in)
1919
50.6 mm (2.0 in)
1920
76.2 mm (3.0 in)
1921
55.6 mm (2.2 in)
1922
40.9 mm (1.6 in)
1923
39.4 mm (1.6 in)
1948
15.2 mm (0.6 in)
1949
17.3 mm (0.7 in)
1950
20.3 mm (0.8 in)
1951
24.7 mm (1.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at San Luis 1 S, 1893 to 1951. The record is 110 days in 1903, marked on the chart; the median year is 35 days.
Longest dry spell (CDD) at San Luis 1 S by year
Year
Longest dry spell (CDD)
1893
23 days
1894
47 days
1895
45 days
1896
38 days
1897
39 days
1898
26 days
1899
30 days
1900
37 days
1901
31 days
1902
39 days
1903
110 days
1904
54 days
1905
54 days
1906
43 days
1907
93 days
1908
35 days
1909
24 days
1910
34 days
1911
23 days
1912
42 days
1913
30 days
1914
58 days
1915
29 days
1916
32 days
1917
75 days
1918
35 days
1919
30 days
1920
69 days
1921
19 days
1922
28 days
1923
25 days
1948
27 days
1949
28 days
1950
59 days
1951
15 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
20 years with a frost
Across 20 years with a frost, the median last spring frost at San Luis 1 S falls on 15 June and the median first autumn frost on 14 September, which leaves a median of 91 days between them.
Frost dates and growing season at San Luis 1 S
Measure
Median, all years
Earliest period
Recent period (1894 to 1922)
Recent against earliest
Fitted trend
Last spring frost
15 June
n/a
15 June
n/a
n/a
First autumn frost
14 September
n/a
14 September
n/a
n/a
Growing days
91 days
n/a
91 days
n/a
n/a
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Download the Data
Data for San Luis 1 S standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Luis 1 S threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-13 (13 October 2026). Records are computed by this site and are not official.